/*****************************************************************************
                                   日期资料1900-2050
*****************************************************************************/
var lunarInfo=new Array(
0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,
0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,
0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,
0x06566,0x0d4a0,0x0ea50,0x06e95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,
0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,
0x06ca0,0x0b550,0x15355,0x04da0,0x0a5d0,0x14573,0x052d0,0x0a9a8,0x0e950,0x06aa0,
0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,
0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b5a0,0x195a6,
0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,
0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x055c0,0x0ab60,0x096d5,0x092e0,
0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,
0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,
0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,
0x05aa0,0x076a3,0x096d0,0x04bd7,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,
0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0);

var nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十');

var nStr2 = new Array('初','十','廿','卅','　');

function lYearDays(y) {
   var i, sum = 348;
   for(i=0x8000; i>0x8; i>>=1) {
      sum += (lunarInfo[y-1900] & i)? 1: 0
   }
   return(sum+leapDays(y));
}

function leapDays(y) {
   if(leapMonth(y))  return((lunarInfo[y-1900] & 0x10000)? 30: 29);
   else return(0);
}


function leapMonth(y) {
   return(lunarInfo[y-1900] & 0xf);
}


function monthDays(y,m) {
   return( (lunarInfo[y-1900] & (0x10000>>m))? 30: 29 );
}

function Lunar(objDate) {

   var i, leap=0, temp=0;
   var baseDate = new Date(1900,0,31);
   var offset   = (objDate - baseDate)/86400000;

   this.dayCyl = offset + 40;
   this.monCyl = 14;

   for(i=1900; i<2050 && offset>0; i++) {
      temp = lYearDays(i);
      offset -= temp;
      this.monCyl += 12;
   }

   if(offset<0) {
      offset += temp;
      i--;
      this.monCyl -= 12;
   }

   this.year = i;
   this.yearCyl = i-1864;

   leap = leapMonth(i);
   this.isLeap = false;

   for(i=1; i<13 && offset>0; i++) {

      if(leap>0 && i==(leap+1) && this.isLeap==false)
         { --i; this.isLeap = true; temp = leapDays(this.year); }
      else
         { temp = monthDays(this.year, i); }


      if(this.isLeap==true && i==(leap+1)) this.isLeap = false

      offset -= temp
      if(this.isLeap == false) this.monCyl ++
   }

   if(offset==0 && leap>0 && i==leap+1)
      if(this.isLeap)
         { this.isLeap = false; }
      else
         { this.isLeap = true; --i; --this.monCyl;}

   if(offset<0){ offset += temp; --i; --this.monCyl; }

   this.month = i;
   this.day = offset + 1;
   this.getDay = function(){
	   if(this.year > 2050 || this.year < 1900 || this.month > 12) return "";
	   var s;
	   var d = this.day;
	   if(d==1){
	    return (this.isLeap?'闰':'') + this.month + '月' + (monthDays(this.year,this.month)==29?'小':'大');
	   }
	   switch (d) {
	      case 10:
	         s = '初十'; break;
	      case 20:
	         s = '二十'; break;
	         break;
	      case 30:
	         s = '三十'; break;
	         break;
	      default :
	         s = nStr2[Math.floor(d/10)];
	         s += nStr1[d%10];
	   }
	   return(s);   
   }
}
